- Dibranchiata, subclass Dibranchiata, Dibranchia, subclass Dibranchia - comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)
--1 is a kind of class
--1 is a member of Cephalopoda, class Cephalopoda
--1 has members:Octopoda, order Octopoda; Decapoda, order Decapoda; Belemnoidea, order Belemnoidea